16 AGL_Stream_ST_A2L_A1_4M_6M_EN_Rev00
4 Electrical connection
4.1 General recommendations
The compressor terminal box has a wiring diagram on the inside of its cover. Before connecting the
compressor, ensure the supply voltage, the phases and the frequency match the nameplate data.
The knockouts on the terminal box have to be removed before the electrical glands can be installed.
First make sure that the terminal box is closed with the terminal box cover. Emerson recommends to
use a subland twist driller to avoid any damage to the box while removing the knockouts.
Figure 16: Knockouts on electrical box
For safety reasons, Emerson recommends that the electrical installation be executed in compliance
with standard EN 60204-1 and/or other standards and regulations of application when dealing with
A2L mildly flammable refrigerants such as R454C, R455A and R454A.
When installing 4M* or 6M* compressors in A2L systems, the following measures must be taken:
▪ To ensure the wires are properly terminated, the correct terminal and clamping tool for the
selected wire size must be used.
▪ The ground wiring must conform to local regulations and codes of practice (only the provided
parts must be used).
▪ The grounding screw must be torqued to 4.5 to 5.7 Nm.
▪ A cable strain-relief device must be added.
▪ Cable and wires must be protected against sharp edges.
4.2 Electrical installation
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard! In
applications with A2L refrigerants, the electrical connection of the compressor
is not an ignition source during normal operation but could become one if not
installed properly according to installation instructions. Ensure correct
mechanical and electrical installation.
Follow the installation and torque instructions below.
System capacitors may remain charged for several minutes after shutdown.
Before starting to work on the electrical installation make sure sparking is not
possible. Continuously check if the ambient atmosphere is non-flammable
when working on the electrical installation.
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard!
Electrical connections of compressor accessories, eg, crankcase heater,
solenoid valves, Copeland compressor electronics modules, etc. are not
ignition sources during normal operation in an A2L-refrigerant system but
could become one if not installed properly according to installation
instructions. All cable ends must be fixed properly in the terminal blocks.
Ensure permanent and safe connection of all cable connections.
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